BALTIMORE (AP) – The U.S. Department of Justice won’t bring federal charges against six police officers involved in the arrest and death of Freddie Gray, a young black man whose death touched off weeks of protests and unrest in Baltimore.

The officers were charged by state prosecutors after Gray’s neck was broken in the back of a police transport wagon in April of 2015. The 25-year-old was handcuffed and shackled at the time, but he was unrestrained by a seat belt.

Three officers were acquitted at trial. Baltimore State’s Attorney Marilyn Mosby dropped the remaining state cases.

The Gray family’s attorney, Billy Murphy, says the Justice Department informed him on Tuesday that no charges would be filed.